In a Microsoft Skype for Business Server 2015 environment, assume that a Skype for Business on Mac user is a delegate of multiple delegators. The first time that the user tries to create a meeting in the Outlook for Mac client on behalf of a delegator, the process works. However, if the user soon after creates a meeting for a second delegator, the process fails.


To fix this issue, install the August 2021 cumulative update 6.0.9319.619 for for Skype for Business Server 2015 and Unified Communications Managed API 5.0 Runtime.

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